Question

物体从斜面顶端有静止匀加速滑下,

Answer 1

题目简单:

S1:S2=3:7

(1/2at^2)/(v1*t1+1/2at^2)=3/7

(v1*t+1/2at^2)-(1/2at^2)=6

得:v1=2 a=1

t1=v1/a=2/1=2

总时间T=2+3=5S

总长L=1/2aT^2=12.5m